>>99846not suggesting you cut off ties with the whole group - it's possible to maintain friendships with people who are friends of an ex - but if you're certain that it's not going to work out between you two, then the last thing you want is to give your ex any hint (intentional or unintentional) that there's still a chance of things working out, and that pretty much rules out maintaining any kind of casual friendship with them. that's what i meant by tearing off the bandaid rather than letting things linger.
i've made that mistake, tried to remain friends with a guy i broke up with because i cared about him and didn't want to cut him out of my life completely, but it wound up hurting both of us more in the long run - he didn't move on because he kept holding out hope that we might get back together, and i didn't feel comfortable letting any of my relationships get serious while he was still a very present part of my life. it got to the point where i was actively hating him for staying around and hating myself for letting him stay around. cutting him out of my life hurt, and not all of my friendships survived unscathed, but it wasn't until i finally did that that both of us were able to move on.